Pneumatic tool



June 3 1924. 1,496,653

H. CORMACK PNEUMATIC TOOL Filed Feb. 5. 1920 2 Sheets-Sheet 1 ..15 .Z0 1L J4 III/111111111114 lm/venlo@ Wfiness es Henry 'ormacli' attenta;

H. CORMACK PNEUMAT I C TOOL June 3 1924. 1,496,653

Filed Feb. 5. 1920 2 sneeps-sheer 2 ffawaw. y

Patented .lune 3, i224.

HENRY CORMACK, OF QUINCY, MASSACHUSETTS.

PNEUMATIC TOOL.

Application filed February 3, 1920. Serial No. 356,034.

To @ZZ lwhom t may concern:

Be it known that I, HENRY Common, a citizen of the Ilnited States, residing at Quincy, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Pneumatic Tools, of which the following is a. speciiication.-

This invention relates to means for operating pneumatic tools and has for an object the provision of a device in which the tool is connected directly with the operating means, thereby eliminating the use of an air compressor and resulting in a relatively small operating device which is readily portable.

Another object is the provision of a pneumatic operating device, in which the stroke of the tool may. be accurately regulated to adapt the same to delicate work, such as carving flower stems figures and the like in relief, the operator having at all times perfect control of the stroke which is delivered in a uniform and constant manner.

Another object of the invention is the provision of a device of the above character, by means of which a plurality of pneumatic tools may be simultaneouslyT operated, or one or more of the tools cut out, provision being made for equalizing the pressure so as to prevent damage to the parts, due to excess pressure, when this is done.

Other objects and advantages of the invention will appear as thefollowing description is read in connection with the accompanying drawings.

In the drawings: i

Figure 1 is a view in side elevation showing the invention adapted for the operation of a number of tools.

Figure 2 is a planview of the same.

Figure 3 is an enlarged sectional view of the operating member.

Figure 4 is an enlarged section through the pressure equalizing safety valve.

Figure 5 is a similar view through t-he tool.

Referring to the drawings in detail, wherein like characters of reference denote corresponding parts, the invention comprises an operating member which is designated in its entirety by the reference character 10. This member comprises a cylinder l1, within which opera-tes a piston 12. The rod of the piston is indicated at 13 and the outer end of this rod carries a cross head 14, which operatesy in suitably supported guides 15.

The cross head' is provided with a slot 17 and operating within the slot is' a pin 18, which is eccentrieally mounted upon a/disk 19. The disk 19 is carried by a shaft 20, which is mounted in suitable bearings 21. The' shaft20 carries a fly wheel 22 and a pulley 23 by means of which suitable power may be applied to the shaft for the purpose of operating the piston 12. The cylinder 11 is closed at one end and is provided with a nipple 24, which communicates with the interior of the cylinder and which provides for the connect-ion of a main pipe 25. A number of branch pipes 26 are connected to the main pipe 25 and these branch pipes have connected to their outer ends tools' 27 which are operated by the action of the piston 12. The tools 27y include a casing 28, within which operates a hammer 29, the latter acting upon the inner end of a bit 30 which is' held within the casing 28 by mea-ns of a chuck 31.

In the operation of the tool, the hammer 29 is driven into Contact with the inner end of the bit 30 by the inward stroke of the piston 12. due to air being suddenly forced through the main pipe 24 and the branch pipe 26. The return stroke of the piston 12 will cause a suction through these pipes to draw the hammer inward away from the inner end of the bit, this action being repeatcd with great rapidity, so that a constant and uniform number of blows are delivered upon the inner end of the bit.

In order to provide for the cutting out of one or more of the tools 27 each of the branch pipes 26 is provided with a valve 32, which ymay be entirelyT closed to cut out the tool desired, or may be partly closed to decrease the strength of the blows delivered upon the end of the bit. For the purpose of preventing damage to the parts when one or more of the tools are eliminated, there is provided an equalizing device, which consists of a cylinder 33, one end 34 of which is in communication with the main'air pipe 25. Located within the cylinder 33 is a piston 35, which is normally held inactive within the cylinder by means of springs 36, located upon opposite sides of the piston, while the outer end of the cylinder 33 is provided with an air vent 37. When all of the tools are in use, the piston is held against movement by the springs 36, but when one of the, tools are cut 0H, the piston reciprocate's' within the cylinder under the force @it the piston- 12 in the operating member, the length of the stroke of the piston 35 being regulated by the number of tools 27 which are out of action.

It will be Seen from the foregoing description and the accompanying drawings that the invention provides an operating means for pneumatic tools, in which the tool is at all times under perfect control7 the operator being enabled to regulate the strength of the stroke in a manner to permit of its use in work orn a most exacting character. The tool further reduces the cost of operating power, as the operating member may be driven from a small motor, or by hand power if desired. This further does away with the objectionable oil and dirty Water which in the use of the ordinary air operated tool, stains the work, and having no exhaust, there will be no cold air blowing upon the worlrmens hands leaving them White and numb and no cloud of stone dust to be inhaled by the operator. The invention possesses many other advantages, one of which is that it may be easily transported to cemeteries for cutting names upon monuments and there operated by hand power or by a belt connected to the rear wheel of an automobile.

The invention is susceptible ot various changes in its form, proportions and minor details of construction, and the right is herein reserved to make such changes as properly fall within the scope of the appended claim.

Having described the invention what is claimed is In combination with an air compressor and an air conveying pipe leading there- "from, of branch pipes communicating with the air conveying pipe, tools carried by the free end of each branch pipe, a valve arranged between the ends of each branch pipe, and being adapted to control the air to its tool, an equalizing cylinder arranged intermediate the ends of the conveying pipe and being provided with an air vent, a piston slidably mounted in the cylinder and coil springs disposed in the cylinder upon op- 'posite sides of the piston as and for the purpose specified.

In testimony whereof I affix my signature.

HENRY CORMACK. 

